JP2824038B2 - Exhaust gas purification device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine exhaust gas purification apparatus for purifying exhaust gas of an internal combustion engine.

[0002]

2. Description of the Related Art An example of a conventional intake and exhaust system of an internal combustion engine is shown in FIG.
2 , a is an internal combustion engine, and b is an internal combustion engine a
Is an intake pipe for supplying combustion air to the internal combustion engine a, and d is an exhaust pipe for discharging exhaust gas from the internal combustion engine a.
Is mixed with air flowing from the intake pipe c and burns, and the exhaust gas after the operation of the internal combustion engine a is discharged from the exhaust pipe d.

[0003] Nitrogen oxides (NOx) contained in the exhaust gas
As a method of reducing the exhaust gas, there is a method of mixing an inert gas into a part of the intake air of the internal combustion engine a, and as a specific embodiment of the method, exhaust gas recirculation for returning the exhaust gas of the internal combustion engine to the intake gas as an inert gas ( EGR) is used.

In an internal combustion engine a using crude oil as a fuel, a large amount of fine particles and sulfur oxides are contained in exhaust gas, and when exhaust gas recirculation (EGR) is performed to reduce nitrogen oxides in exhaust gas, Is arranged a filter e and a cooler f in the middle of a circulation pipe g connecting the exhaust pipe d and the intake pipe c. After a part of exhaust gas flowing through the exhaust pipe d is cleaned by the filter e and cooled by the cooler f The inert gas is supplied to the intake pipe c to be mixed with the combustion air.

[0005]

Generally , in an internal combustion engine a which recirculates exhaust gas , a crude oil is always burned as fuel.
As a result, clogging and fouling of the filter e occur due to fine particles contained in the exhaust gas, and fouling and wear of the circulation pipe g, the cooler f, the intake pipe c, and the ring / liner of the internal combustion engine a are reduced. When using a fuel containing sulfur as the fuel, there is a problem that sulfur oxides in the exhaust gas corrode the ring liner and the like.

The present invention solves such a problem.
It is an object of the present invention to provide an exhaust gas purifying apparatus for an internal combustion engine which can supply exhaust gas containing a small amount of fine particles and sulfur oxides as an inert gas to an intake pipe as needed, thereby preventing the internal combustion engine from being worn or corroded. It is assumed that.

[0007]

To achieve the above object, the present invention provides an internal combustion engine, an exhaust manifold, a fuel supply system for supplying fuel to the internal combustion engine, and an air supply to the internal combustion engine. An intake pipe for an internal combustion engine that supplies the exhaust pipe, and an exhaust pipe for the internal combustion engine that guides exhaust gas of the internal combustion engine to the exhaust manifold.
A combustor provided separately from the internal combustion engine, a combustor fuel supply system for supplying fuel to the combustor, a combustor intake pipe for supplying air to the combustor, and An exhaust pipe for the combustor leading to the collecting pipe, a switching adjustment valve provided in the middle of the exhaust pipe for the combustor, a gas mixer provided in the middle of the intake pipe for the internal combustion engine, and one end connected to the switching adjustment valve. An exhaust purification device for an internal combustion engine, comprising: an exhaust passage having the other end connected to the gas mixer; and a gas cooler provided in the middle of the exhaust passage, wherein a fuel switching valve is provided in the middle of a combustor fuel supply system. A fuel supply pipe branched from a fuel supply system for an internal combustion engine is connected to the fuel switching valve, and a high quality fuel is supplied to a fuel supply system for a combustor as needed.
The exhaust of combustors with less particulates and sulfur oxides
Is supplied to the intake pipe for the internal combustion engine, and when it is not necessary to supply the exhaust gas with a small amount of fine particles and sulfur oxides to the internal combustion engine, the fuel for the internal combustion engine can also be supplied to the combustor. I made it.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a system diagram showing one embodiment of the present invention, wherein 1 is an internal combustion engine, 2 is an exhaust manifold for discharging exhaust to the outside, and the internal combustion engine 1 has And a fuel supply system 3 for supplying fuel to the internal combustion engine 1
An internal combustion engine intake pipe 4 for supplying combustion air to the engine and an internal combustion engine exhaust pipe 5 for guiding exhaust gas from the internal combustion engine 1 to an exhaust manifold 2 are provided.

Reference numeral 6 denotes a combustor provided separately from the internal combustion engine 1. The combustor 6 includes a combustor fuel supply system 7 for supplying fuel to the combustor 6 and a combustor 6. And a combustor exhaust pipe 9 for guiding the exhaust gas of the combustor 6 to the exhaust manifold 2.

In the middle of the exhaust pipe 9 for the combustor, the switching adjustment valve 1 is provided.
0 is provided, and a gas mixer 11 is provided in the middle of the above-described intake pipe 4 for the internal combustion engine. One end of an exhaust passage 12 is connected to the switching adjustment valve 10, the other end of the exhaust passage 12 is connected to the gas mixer 11, and a gas cooler 13 is provided in the exhaust passage 12.

In the above configuration, the fuel supply system 7 for the combustor is provided.
A fuel switching valve 17 is provided in the middle of a fuel supply system for an internal combustion engine.
The fuel supply pipe 18 branched from 3 is connected to the fuel switching valve 17
Then, by switching the fuel switching valve 17, the fuel supply for the combustor is performed.
The fuel can be supplied from either the supply system 7 or the fuel supply system 3 for the internal combustion engine.
Switchable so that fuel can be supplied to the baking oven 6
And

In the apparatus shown in FIG. 1, inexpensive heavy oil is supplied to the internal combustion engine fuel supply system 3 as fuel for the internal combustion engine 1, and the internal combustion engine 1 is supplied to the combustor fuel supply system 7 of the combustor 6. A high-quality fuel such as natural gas, gasoline, or kerosene, which does not generate fine particles such as soot and sulfur oxides in the exhaust gas or generates a small amount, is supplied.

The fuel supplied from the fuel supply system 3 for the internal combustion engine to the internal combustion engine 1 is mixed with air for combustion supplied from the intake pipe 4 for the internal combustion engine and burns in the internal combustion engine 1, and the exhaust gas is discharged. The exhaust pipe 2 for the internal combustion engine passes through the exhaust pipe 2, and
It is discharged outside.

The high-quality fuel supplied from the combustor fuel supply system 7 is mixed with combustion air supplied from the combustor intake pipe 8 and burns in the combustor 6, and the exhaust gas is discharged from the combustor exhaust gas. The gas enters the exhaust manifold 2 through the pipe 9 and the switching control valve 10 and is discharged to the outside.

The output of the high-quality fuel burned in the combustor 6 is used as power generation, shaft output, and heat source.

By operating the switching control valve 10 in this state, a part of the exhaust gas of the combustor 6 flowing through the exhaust pipe 9 for the combustor is introduced into the exhaust passage 12, and a part of the exhaust gas of the combustor 6 is supplied to the gas cooler. After cooling at 13, the gas is supplied to a gas mixer 11 provided in the middle of the intake pipe 4 for the internal combustion engine, and the exhaust gas of the combustor 6 supplied to the gas mixer 11 is mixed with air by the gas mixer 11, and occurrence of being supplied to the internal combustion engine 1 nitrogen oxides in the exhaust of the internal combustion engine 1 from the Ru is suppressed.

In the apparatus shown in FIG. 1 , when it is not necessary to reduce nitrogen oxides in the exhaust gas of the internal combustion engine 1, fuel is supplied from the fuel supply system 3 for the internal combustion engine to the combustor 6 through the fuel supply pipe 18. , And the switching adjustment valve 10
The exhaust of the combustor 6 is switched so as not to flow into the exhaust passage 12, and all of the exhaust of the combustor 6 enters the exhaust manifold 2 from the exhaust pipe 9 for the combustor. Therefore, the exhaust gas of the combustor 6 is not mixed with the intake pipe 4 for the internal combustion engine, and only the air is supplied to the internal combustion engine 1 from the intake pipe 4 for the internal combustion engine.

[0019] Thus, an inexpensive fuel used in the internal combustion engine 1 can also be used in a combustor 6, ing to be able to save operating costs of the combustor 6.

[0020]

According to the present invention, a high-quality natural gas, gasoline, kerosene, or the like, which has a small amount of fine particles such as soot and a small amount of sulfur oxides in the exhaust gas, separate from the fuel of the internal combustion engine, is added to the fuel supply system for the combustor. By supplying the fuel, exhaust gas containing less soot and sulfur oxides from the combustor can be mixed with the intake air of the internal combustion engine, so that a filter such as exhaust gas recirculation is not required.
Further, there is an effect that wear and corrosion of the combustion chamber and the like of the internal combustion engine can be reduced.

Then, high-quality fuel is supplied only to the combustor,
Since may generate the amount of combustor exhaust needed to reduce the nitrogen oxides in the exhaust of an internal combustion engine, Ru effect there being kept consumption quality of the fuel to a minimum.

[0022] When it is not necessary to reduce the nitrogen oxides in the exhaust of the internal combustion engine, using inexpensive fuel used in an internal combustion engine to the combustor, the effect there that can save operating costs of the combustor You.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention.

FIG. 2 shows an example of a conventional exhaust gas recirculation (EGR) of an internal combustion engine .
FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 internal combustion engine 2 exhaust manifold 3 fuel supply system for internal combustion engine 4 intake pipe for internal combustion engine 5 exhaust pipe for internal combustion engine 6 combustor 7 fuel supply system for combustor 8 intake pipe for combustor 9 exhaust pipe for combustor 10 switching regulator valve 11 Gas mixer 12 Exhaust passage 13 Gas cooler 17 Fuel switching valve 18 Fuel supply pipe

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02M 25/07 F02D 21/08 311

Claims (1)

(57) [Claims] An internal combustion engine, an exhaust manifold, a fuel supply system for the internal combustion engine for supplying fuel to the internal combustion engine, an intake pipe for the internal combustion engine for supplying air to the internal combustion engine, and an exhaust gas for the internal combustion engine An exhaust pipe for an internal combustion engine that guides the exhaust pipe to the exhaust manifold,
A combustor provided separately from the internal combustion engine, a combustor fuel supply system for supplying fuel to the combustor, a combustor intake pipe for supplying air to the combustor, and An exhaust pipe for the combustor leading to the collecting pipe, a switching adjustment valve provided in the middle of the exhaust pipe for the combustor, a gas mixer provided in the middle of the intake pipe for the internal combustion engine, and one end connected to the switching adjustment valve. An exhaust purification device for an internal combustion engine, comprising: an exhaust passage having the other end connected to the gas mixer; and a gas cooler provided in the exhaust passage .
A fuel switching valve is provided in the middle of the fuel supply system for the internal combustion engine.
Connect the fuel supply pipe branched from the fuel supply system to the fuel switching valve.
Exhaust purification system of an internal combustion engine, characterized in that connection was.